ext4: move extra inode read to a new function

Currently, in ext4_iget we do a simple check to see whether
there does exist some information starting from the end
of i_extra_size. With inline data added, this procedure
is more complicated. So move it to a new function named
ext4_iget_extra_inode.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 11 insertions, 5 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 91a24967b8a..befa005711a 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3700,6 +3700,16 @@ static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
         }
 }
 
+static inline void ext4_iget_extra_inode(struct inode *inode,
+                                         struct ext4_inode *raw_inode,
+                                         struct ext4_inode_info *ei)
+{
+        __le32 *magic = (void *)raw_inode +
+                        EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize;
+        if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC))
+                ext4_set_inode_state(inode, EXT4_STATE_XATTR);
+}
+
 struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
 {
         struct ext4_iloc iloc;
@@ -3842,11 +3852,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
                         ei->i_extra_isize = sizeof(struct ext4_inode) -
                                             EXT4_GOOD_OLD_INODE_SIZE;
                 } else {
-                        __le32 *magic = (void *)raw_inode +
-                                        EXT4_GOOD_OLD_INODE_SIZE +
-                                        ei->i_extra_isize;
-                        if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC))
-                                ext4_set_inode_state(inode, EXT4_STATE_XATTR);
+                        ext4_iget_extra_inode(inode, raw_inode, ei);
                 }
         }